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Note 8 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Federal net operating loss carryforwards | $ 117,564 | $ 95,861
State net operating loss carryforwards | 68,925 | 67,357
Operating lease liability | 199,083 | 198,800
Share-based compensation | 11,276 | 15,029
Other | 60,895 | 60,540
Gross deferred income tax assets | 457,743 | 437,587
Valuation allowance | (50,548) | (41,281)
Deferred income tax assets, net of valuation allowance | 407,195 | 396,306
Difference between book and tax basis of property and intangible assets | 295,343 | 311,365
State tax liability | 41,028 | 45,314
Right of use asset | 195,038 | 194,874
Other | 6,838 | 7,448
Gross deferred income tax liabilities | 538,247 | 559,001
Deferred income tax liabilities, net | $ 131,052 | $ 162,695

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